Thread spool and the method of constructing the same



y 1940- D. MARINS KY ETAL 2.200.721

THREAD SPOOL AND THE METHdD OF CONSTRUCTING 'THE SAME Filed June 1, 1959 INVENITO RS DAv/s MARINSKY BY L OUIS H. MORIN ATTORN Y ?atented May 14, 1940 THREAD SPOOL AND THE THO!) F W consrnnc'riuc '1' serum Davis Marinshy we Louis E. Morin, nmnx, n. if. Application time 1, 1939, Serial in. exam This invention relates to thread spools, commonly referred to as a bobbin for use in connection with the shuttles of sewing machines, or to any other type and kind of spools for supporting threads, lines, cords, wires and the like. More particularly, the invention relates to the method of constructing end flanges of spooled strands of the type and kind under consideration, where- 'in the strands are cross-wound on the spools,

according to the invention.

Fig. 2 is a face view of the spool shown in Fig. 1.

Fig. 3 is a perspective view of the spool illustrating the arrangement of strand windings thereon.

( Fig. 4 is a diagrammatic sectional view illustrating steps in the method of producing'spools according to the invention.

Fig. 5 is a view similar to Fig. 4 showing parts in a different position.

- Fig. 6 is a view similar to Fig. 2 showing another form of construction, and

Fig. 7 is a. view similar to Fig. 2 showing another form of construction.

The present device and method constitutes a continuation in part of the device and method disclosed in our prior application, Ser. No. 263,136, filed March 21, 1939. g a

In Figs. 1 to 3 inclusive is shown, for the purpose of illustrating one use or adaptation of the invention, a spool 8 for supporting thread and commonly referred to as a bobbin, and is adapted for use in connection with the shuttles oi sewing machines. At 9 is shown the core or mandrel upon which the thread I0 is wound in the usual crossed relationship as is clearly illustrated in Fig.3 of the drawing. On the side surfaces of the spool and arranged directly upon and secured to the thread ill or the separate windings thereof where they extend to the side edges of the spool, are flanges ll, Ila both of which are of the same general construction aside from any question of color, and are composed of wax, paril'i. na -2511i amn or other similar materials or compositions suitable for the intended purpose.

The surfaces of the flanges M, Ma are provided with circumferential grooves II? which extend throughout the entire area of the flanges and are of sumcient depth to weaken the wall structure of the flanges so that as the thread is unwound from the spool, pieces or particles of the flanges will be automatically removed by the thread so that when all ofthe thread on the 10 spool has been removed, the. flanges will also have been removed. The cross wound spools in question having what is generally referred to as universal windings, has each turn of the thread in contact with at least one of the side flanges, which will bring about the results above stated As is taught in our prior application, it will be understood that the compositioned flanges adhere to the threads sumciently to hold the thread from unravelling or from accidental unwinding in the stopping of a sewing machine.

However, the threads will be forcibly removable from the flanges and theflange parts will break up and be discarded as the weakened grooved portions are reached.

While from actual experience the structure as disclosed in Figs. 1 to 3 inclusive operate satisfactorily to accomplish the desired result, in some instances we may also provide a series of radial grooves or impressions as indicated at 13 and 14 in Fig. 6 of the drawing in conjunction with circumferential grooves I20. similar to the grooves ii. In this connection it will be understood that any other desired arrangement of the grooves or weakened areas might be provided, it

being understood in this connection that the illustration in Fig. 1 of the drawing is somewhat exaggerated'for clearness in illustration. The film-like flange coating of ,the composition material is relatively thin, and as a matter of fact the degrees of thickness may be varied by the stripping or scraping tool which is employed and later described.

In Fig. 7 of the drawing is shown a slight modification of the structure shown in Figs. ;1 to 3 5 wherein a spiral groove I2!) is provided rather than the series of circumferential grooves, and it will be apparent that the supplmental radial grooves as at l3, H in Fig. 6 are also applicable to a structure such as shown in Fig. 7.

v In Figs. 4; and 5 of the drawing we have diagrammaticallyillustrated the mthod of applying and processing the compositioned flanges l l, Ila. In these figures, l5 represents a tank or crucible in which the wax, 'paraifin or other composition I6 is arranged and heated through any desired heating medium to a predetermined temperature, at least suiiicient to provide a fluid consistency of the material in the tank l5. At I1 is shown a pan supported on an arm I8 pivoted as seen at I9 so that the pan is normally submerged in the material I6, as indicated in Fig. of thedrawing, and is raised into a definite or fixed position as shown in Fig. 4 for the purpose of maintaining atall times a fixed level of the I composition l6 as indicated at lBa in Fig. 4 so that the lower surface of the spool 8 supported upon a spindle 20 can be moved into definite and predetermined relationship with respect to the level I611 in the movement of the spindle 20 toward and from the pan l1, so as to maintain at all times a controlled, regulated and balanced application of the compound to the lower surface of the spool. In other words, itwill be apparent that in providing a definite movement of the spindle in the dipping operation in conjunction with the provision of the constant fixed level of the composition lBa, each spool as well as each side surface of the spool, will be submerged the same degree soas to provide a balanced application of the coating material.

It is also desirable in the movement of the spindle 20 toward and from the level Ilia, to raise the spindle slightly after the first contact with the composition, and then return it for a second submersion or contact before moving the spindle and spool away from the pan I1 for further processing. When raised into a position as shown in Fig. 5 of the drawing, the same is held in this position for a short period of time to allow the composition to congeal or solidify to some degree. The spindle is then rotated fast so that centrifugal action will spread the composition more or less evenly upon the surface of the spool, after which a scraping and grooving tool 2| is moved into position beneath the lower surface of the coated spool and in spaced relation to the wax .coating lBb arranged thereon. The tool is moved in the direction of the coated surface of the spool while the same is rotated so as to form the grooves l2 therein by the teeth provided .on the upper surface of the tool. This tool, in

addition to forming the grooves l2, also removes surplus material I6b so as to produce on the finished spool the compositioned flanges H, Ila of predetermined thickness. The removed surplus and the material removed in forming the grooves l2 will drop back into the tank l5 and be remelted. It will be understood that the tool 2| is in the form of an arm extending from a sleeve 23 oscillating on ashaft 24, the tool being actuated through the medium of a crank arm 25 to which an operating lever 26 is connected, or any other means may be provided for this purpose. This construction to move the tool into and out of the path of movement of the spindle or the workpiece supported thereon, as will be apparent. It will also be understood that. the tool 21 may be moved into position beneath the spool just prior to the starting of the spool rotation or while.

the spool is being rotated.

It will be understood that after one side surface of the spool has been processed, the spool is inverted on the spindle to cut or process the other surface thereof, and'the above described operation will be repeated. The particular means; for applying and removing the workpiece or spool with respect to the spindle is not disclosed 'as' it forms no specific partof the present method, and

this operation may of course be performed by.

hand or automatically, as desired.

It will be understood 'that in producing the I structure shown in Fig. '7 of the drawing, instead of using a series of teeth or projections?! on the tool, asingle tooth will be employed and automatically fed inwardly andradially with respect to the spindle in the rotation of the spind1e, suitable means being provided for operating the tool in this manner in conjunction withthe swinging movement provided therefor to move the tool toward and from the workpiece;

With the construction shown in Fig. 6, the radial grooves or impressions may be formed by placing the flanged spool between dies which will form the said radial grooves therein, and both surfaces may be grooved in this manner in one operation or in two independent operations, one on each surface of the spool.

It will be understood that our present invention is applicable to spools of different types and kinds of materials and of different structural arrangement, in accordance with the teachings in our prior application. It will also be apparent that in further processing the spool in accordance with theteachings in Fig. 6 of the drawing, instead of applying simply radial grooves or impressions, trade names or. other markings might be formed in the surfaces of the flanges inde-.

pendent of or in conjunction with other markings which would provide substantially the same characteristics of the structure as shown in Fig. 6. Having fully described our invention, what we claim as new and desire to secure by Letters Patent, is:

1. A spool of strand-like material comprising a core with the strand-like material wound in a core with the strand-like material wound in' crossed relationship thereon, the sides of said spool comprising discs of relatively soft plastic material extending from the core to the outermost windings of the strand on said spool, the

' outer surfaces of said discs having grooves extending-over substantially the entire area thereof to weaken the structure of the discs'causing said discs to break up into particles removable from the spool in the process of unwinding the strand therefrom, said grooves being arranged circumferentially.

3. A spool of strand-like material comprising a core with the strand-like material wound in crossed relationship thereon, the sides of said spool comprising discs of relatively soft plastic material extending from the core to the outermost windings of the strand on said spool, the outer surfaces of said discs having grooves extending over substantially the entire area there of to weaken the structure of the discs causing said discs to break up into particles removable from the spool-in the process of unwinding the strand therefrom, said grooves being arranged circumferentially, and including other grooves extending between and joining adjacent circumferential grooves. I 

